/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.sms;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.hisp.dhis.sms.incoming.IncomingSms;
import org.hisp.dhis.sms.incoming.IncomingSmsService;
import org.springframework.stereotype.Component;

@Component( "org.hisp.dhis.sms.MessageQueue" )
public class DatabaseSupportedInternalMemoryMessageQueue
    implements MessageQueue
{
    private List<IncomingSms> queue = new ArrayList<>();

    // -------------------------------------------------------------------------
    // Dependencies
    // -------------------------------------------------------------------------

    private final IncomingSmsService incomingSmsService;

    public DatabaseSupportedInternalMemoryMessageQueue( IncomingSmsService incomingSmsService )
    {
        checkNotNull( incomingSmsService );
        this.incomingSmsService = incomingSmsService;
    }

    // -------------------------------------------------------------------------
    // Implementation
    // -------------------------------------------------------------------------

    @Override
    public void put( IncomingSms message )
    {
        queue.add( message );
    }

    @Override
    public IncomingSms get()
    {
        if ( queue != null && queue.size() > 0 )
        {
            return queue.get( 0 );
        }

        return null;
    }

    @Override
    public void remove( IncomingSms message )
    {
        queue.remove( message );
    }

    @Override
    public void initialize()
    {
        Collection<IncomingSms> messages = incomingSmsService.getAllUnparsedMessages();

        if ( messages != null )
        {
            queue.addAll( messages );
        }
    }
}
